Product-Joining

JOINING

STEELS:

Steel and Carbon Steels metal is the most common base metal in the Industry. There are various grade of medium carbon and high carbon steels and they are categorized as per standards. As far repair welding is concerned an electrode should be used of such a metallurgy that is suitable for if not for all, at least majority combinations.

The selection procedure for each category has been considered while formulating a product and accordingly the product range has been made. A detailed procedure for welding is also given for each product so as to get the best benefits.

o CARBON STEEL

BOBWELD 10 - UTS: 45 Kg/mm2 (65,000 psi)

BOBWELD 13 - UTS: 48 Kg/mm2 (72,000 psi)

BOBWELD 14 - UTS: 57 Kg/mm2 (81,000 psi)

STAINLESS STEEL:

This is a version of alloy steel. The Cr-Ni steel itself has lot of other combinations purely depending upon the service conditions. Its selection is also done according to the base metal properties as mentioned in AISI. When it comes to selection of welding consumables for repair, versatility is the key word. This is more required in the case of joining of combinations, which is very common in repair welding.

To suit this requirement a healthy range is available to tackle any sort of problem. The selection is made very easy and the results are excellent.

o STAINLESS STEEL

BOBSTAIN 38L - UTS : 55 Kg/mm2 (80,000 psi)

BOBSTAIN 36L - UTS : 60 Kg/mm2 (90,000 psi) Elongation: 35%

BOBSTAIN 30 - UTS : 65 Kg/mm2 (95,000 psi) Elongation: 30%

BOBSTAIN 30HC - UTS : 65 Kg/mm2 (95,000 psi)

BOBSTAIN 30HT - UTS : 75-80 Kg/mm2 (1,10,000 psi)

BOBSTAIN 30HZ - UTS : 76-80 Kg/mm2 (1,10,000 psi)

BOBSTAIN 44 - UTS : 52-55 Kg/mm2 (78,000 psi)

BOBSTAIN 48 - UTS : 60-62 Kg/mm2 (85,000 psi)

ALLOY STEELS:

Alloy steels, be it high alloy or low alloy, are superior version of steels. Their selection as base metal is done purely on the requirement of the part or machine and they are required to give desired physical as well as chemical properties to the part.

There are different versions of metals available in the category and hence in case of repair and maintenance welding, the most important criteria is versatility of the product along with other service properties. Depending upon the service requirement and Industry, each product is to be selected.

o ALLOY STEEL / DISSIMILAR METAL

BOBSTAIN 6 - UTS : 88-90 Kg/mm2 (1,30,000 psi)

BOBSTAIN 7 - UTS : 70 Kg/mm2 (1,00,000 psi)

BOBSTAIN 12 - UTS : 76 Kg/mm2 (1,10,000 psi)

BOBSTAIN 15 - UTS : 80-84 Kg/mm2 (1,15,000 psi)

BOBSTAIN 16 - UTS : 85 Kg/mm2 (1,20,000 psi)

BOBSTAIN 17 - UTS : 65 Kg/mm2 (95,000 psi)

BOBSTAIN 18 - UTS : 60 Kg/mm2 (85,000 psi) Elongation:30%

BOBSTAIN 19 - UTS : 60 Kg/mm2 (85,000 psi)

BOBSTAIN 20 - UTS : 80-82 Kg/mm2 (1,16,000 psi)

BOBSTAIN 21 - UTS : 68 Kg/mm2 (95,000 psi)

CAST IRON:

Cast iron is the most widely used base metal by the Industry, because of its versatility at production stage & economy. Majority of heavy equipments use cast iron as a major base metal. It has different grades and each grade has different metallurgy and grain distribution.

Cast Iron welding is a typical job. A full range is available to tackle any type of cast iron job. A detailed procedure is also mentioned as this becomes very crucial for the successful job completion.